![]() In general people use this software for creating FIR filters for "phase correction" after all the driver passband linearization filters + crossover filters work on the audio signal in a DSP crossover implementation. One can define FIR filters and IIR filters in it (or simple FIRs using it was all I have played with for creating FIR filters in audio). So when I say a 400Hz tone, I mean a 400 Hz sinewave. Just a matter of terminology.īy a tone, I mean a sinewave of a particular frequency. ![]() I was just confused by the term 'regular' phase filter. If it is PC-BASED DSP reasonable length FIRs are a piece of cake for PCs these days. Atleast Acourate seems to have it as per their website. I think they have FIR processing capabilities. Off course, no subjectivity explored here.Ĭlick to expand.I have heard about Accourate and Audiolense. And I think we should really make use of it and deal with fundamental problems like diffraction at the level that it should be solved. However, with great softwares becoming available for free for enclosure design, crossover design, availability of CNC and 3D printing etc, it is easier to fabricate good acoustic designs better now than ever before. I feel that in the past, one of the most common reasons why enclosure design was chosen as a typical cuboid was because of the difficulty in manufacturing good shapes. DSP can be employed to address many issues but acoustic design issues should be the last thing we should tell the DSP to handle. Even with cheap but good quality drivers, great speakers can be made with a great acoustic design but with bad acoustic design, even the best drivers are a little lost in terms of the level of performance they can reach. One of the reasons most high end companies do curved and rounded kind of cabinets for this reason (other than aesthetics). So to deal with that ideally the first step we should take is to make the shape of the housing aid the driver do its thing and get out of the way. Due to diffraction the shape of the cabinet the driver is housed is also seriously affects the overall response. Ideally we want to hear just the driver doing its thing. Regarding the solution to the diffraction problem, people have time and again showed that the typical shoe-boxed sized enclosures are not the best enclosure designs for housing the drivers. We even have access to powerful wave front simulators these days which help us a lot in visualizing the problem in 3D rather than just one or two frequency responses in certain directions. With the availability of softwares like VituixCAD this can be easily seen and believed. Often if one doesn't carefully apply EQ, it will screw up the off axis radiation or the overall directivity characteristics. However, diffraction (whether it is caused by cabinet, or baffle, or something else) affects not only on-axis radiation but also off-axis behavior and that is particularly important with speaker placement in typical rooms. The amount of EQ that can be done to the driver + cabinet response is just incredible these days. This is especially true with access to cheap DSP processors. Most frequently, especially for beginners, what is usually done is look at an on-axis frequency response measurement or a slightly off-axis one, identify the peaks and dips and try to flatten it into a straight line in the crossover design or at least that is how I started. So if we try to solve it completely in the electrical domain, it may result in undesired results, if we are unlucky. The issue with diffraction is that it is a fundamental problem to be solved mostly in the acoustic domain. I keep posting about these things mostly for my own education and others interested about the engineering aspects behind them. I don't know anything about Car audio, but I can imagine the much greater challenge it can present when one wants to set up a good sound system due the aspects like reflections.Īnyway, I know that the diffraction problem has been beaten to death in the past.
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